mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White to opaque; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: White to opaque
Luster: Vitreous to greasy

Identified June 2, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to opaque; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. Milky quartz gets its appearance from tiny fluid inclusions of gas or liquid trapped during crystal growth. They are found across all geological ages.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, construction aggregates, and as a semi-precious gemstone in jewelry.

Geological facts

Quartz is the most abundant and widely distributed mineral found at Earth's surface. Milky quartz is the most common variety of crystalline quartz.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), lack of cleavage, and white opaque color. Commonly found in gravel, stream beds, and mountainous regions worldwide.